[wip] library: migrate public/feature layer of iOS library to Swift

Signed-off-by: Mike Schore <[email protected]>

BUILD

@@ -8,13 +8,10 @@ envoy_package()
 
 ios_static_framework(
     name = "ios_framework",
-    hdrs = [
-        "//library/objective-c:envoy_framework_headers",
-    ],
     bundle_name = "Envoy",
     minimum_os_version = "10.0",
     visibility = ["//visibility:public"],
-    deps = ["//library/objective-c:envoy_objc_interface_lib"],
+    deps = ["//library/swift:envoy_swift_lib"],
 )
 
 genrule(

library/objective-c/BUILD

@@ -1,15 +1,7 @@
 licenses(["notice"])  # Apache 2
 
-filegroup(
-    name = "envoy_framework_headers",
-    srcs = [
-        "Envoy.h",
-    ],
-    visibility = ["//visibility:public"],
-)
-
 objc_library(
-    name = "envoy_objc_interface_lib",
+    name = "envoy_engine_objc_lib",
     srcs = [
         "Envoy.h",
         "Envoy.mm",

library/objective-c/EnvoyEngine.h

@@ -0,0 +1,14 @@
+#import <Foundation/Foundation.h>
+
+/// Wrapper layer to simplify calling into Envoy's C++ API.
+@interface EnvoyEngine : NSObject
+
+/// Run the Envoy engine with the provided config and log level. This call is synchronous
+/// and will not yield.
++ (int)runWithConfig:(NSString *)config logLevel:(NSString *)logLevel;
+
+/// Run the Envoy engine with the provided config and log level. This call is synchronous
+/// and will not yield.
++ (int)runWithConfig:(NSString *)config;
+
+@end

library/objective-c/EnvoyEngine.mm

@@ -0,0 +1,23 @@
+#import "library/objective-c/EnvoyEngine.h"
+
+#import "library/common/main_interface.h"
+
+@implementation EnvoyEngine
+
++ (int)runWithConfig:(NSString *config) {
+  return [self runWithConfig:config logLevel:@"info"];
+}
+
++ (void)runWithConfig:(NSString *config) logLevel:(NSString *logLevel) {
+  try {
+    return run_envoy(config.UTF8String, logLevel.UTF8String);
+  } catch (NSException *e) {
+    NSLog(@"Envoy exception: %@", e);
+    NSDictionary *userInfo = @{ @"exception": e};
+    [NSNotificationCenter.defaultCenter postNotificationName:@"EnvoyException"
+                                        object:self
+                                        userInfo:userInfo];
+  }
+}
+
+@end

library/swift/BUILD

@@ -0,0 +1,11 @@
+licenses(["notice"])  # Apache 2
+
+swift_library(
+  name = "envoy_swift_lib",
+  srcs = [
+    "Envoy.swift",
+  ],
+  module_name = "Envoy",
+  visibility = ["//visibility:public"],
+  deps = ["//library/objective-c:envoy_engine_objc_lib"]
+)

library/swift/Envoy.swift

@@ -0,0 +1,37 @@
+import Foundation
+import EnvoyEngine
+
+public class Envoy {
+  private let runner: EnvoyRunner
+
+  public var isRunning: Bool {
+    runner.isExecuting()
+  }
+
+  public var isTerminated: Bool {
+    runner.isFinished()
+  }
+
+  public init(config: String, logLevel: String) {
+    runner = EnvoyRunner(config: config, logLevel: logLevel)
+    runner.start()
+  }
+
+  public convenience init(config: String) {
+    self.init(config: config, logLevel: "info")
+  }
+
+  private class EnvoyRunner : Thread {
+    let config: String
+    let logLevel: String
+
+    init(config: String, logLevel: String) {
+      self.config = config
+      self.logLevel = logLevel
+    }
+
+    func main() {
+      EngineEngine.run(config: config, logLevel: logLevel)
+    }
+  }
+}